From: "steve Izett" <flyrotary@lancaironline.net>
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Subject: Oil and water delta temps
Message-Id: <4323A267-FC61-43EF-BCEA-B414019D92EC@gmail.com>
Date: Sat, 26 Nov 2016 07:42:53 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Hi guys
I thought I should provide an update.=20

Our final ground testing has been interrupted by a dead battery and a =
fuel leak.
With these fixed we were able to weight the aeroplane to check CofG and =
do a longer run to check idle temps in the warmer weather.

With an OAT of mid 80=E2=80=99s F I started her up and after 30 mins at =
~1700RPM I switched her off when the water leaving the engine hit 220F.
One mystery I=E2=80=99m pondering. Having run out of sensor inputs on =
the Dynon Skyview Engine Monitor I put a switch into the oil and water =
senders so I can read either oil & water temps into the exchangers or =
out.
Now when I put the switch in the circuit the wires weren=E2=80=99t =
marked so I had a 50/50 chance of getting the in and out right on the =
DPDT.
So on next engine run realised that I got them wrong. In one position I =
read oil out and Water in, and vice versa.
I=E2=80=99ll have to switch a couple wires next time I=E2=80=99m =
soldering in the cockpit.

But here=E2=80=99s the mystery. As temps rose, at some point when I =
switch between in/out temps, they now both read higher in one switch =
position and lower in the other position!
How can that be?
Now the water circuit doesn=E2=80=99t have a thermostat while the RX7 =
turbo oil cooler does.
Can anyone provide some helpful logic?
Also,  can any of you provide figures for your water and oil delta temps =
on the ground? What do you get across your coolers?

On another note I was really pleased to see the Empty Weight come in on =
the low side.
The CG close to the forward limit.

Getting close to first flight.

Cheers
Steve Izett
Glasair Super II RG Renesis 4 port, RD1C 2.85:1, EC3, EM3